Honey, those Aztecs weren't messing around when it came to building pyramids. It took them anywhere from a few months to several years to construct those bad boys, depending on the size and complexity. So, grab a snack and get comfy, 'cause building a pyramid was definitely a long-term project for those ancient folks.
There is no way to know exactly how long it took to build the Egyptian pyramids. Herodotus was told that the great pyramid at Giza was built in twenty years; however, scientists today claim it could have been built in as few as ten years.
You've got to build a 3 dimensional triangle. Lay the first three matches flat on the table touching one another in the shape of a triangle, then put the remaining three matches at each of the corners of the original three matches so that the second set of three meet together at the apex above the original three matches. Visually, it would take the shape of a pyramid. That will give you four equal triangles.
I think about 100 years
The edges are 4 inches long. Than you take how many faces and than multiply. Your answer is 16.
A minimum of 2 triangles are needed, but you can also make a rectangle with 3 or more triangles.